[PATCH] Pull Lexer's CharInfo table out for general use throughout Clang

[Jordan Rose]

  Address comments:

  - Use `!= 0` instead of `? true : false`.
  - Add CHAR_XLETTER to distinguish hex digits from other letters.
  - Use unit tests to validate the CharInfo table, instead of a static validation function in Lexer.

Hi rsmith, bkramer, gribozavr, joerg,

http://llvm-reviews.chandlerc.com/D363

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D363?vs=865&id=892#toc

Files:
  include/clang/Basic/CharInfo.h
  lib/Basic/CMakeLists.txt
  lib/Basic/CharInfo.cpp
  lib/Lex/Lexer.cpp
  unittests/Basic/CMakeLists.txt
  unittests/Basic/CharInfoTest.cpp
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